[ENH] add stac reader using the intake-stac driver

[acocac]

The PR aims to incorporate stac catalogs in scivision. There is a intake driver to explore them, however, the filename is not a YAML/YML file.

Changes required

• add or create a new function to intake-stac driver in reader.py.

[acocac]

PR related to #232

[edwardchalstrey1]

We can use the tutorial here to help: https://intake-stac.readthedocs.io/en/latest/tutorial.html

[edwardchalstrey1]

@acocac It looks like a problem here is that the intake_stac.StacCollection class doesn't yet have a to_dask() function implemented

Edit: Ok I was doing this wrong somehow, I see this works on their quickstart instructions: https://github.com/intake/intake-stac#quickstart

[acocac]

@edwardchalstrey1 thanks for having at look at the PR. @ots22 and I discussed which was the most practical approach in the latest co-working session. We have two routes:

1. contribute to the intake-stac driver.
2. use other libraries supporting fetching STAC items into xarray objects. We have two options: odc-stac or stackstac. Which is the most optimal? Sharing a benchmark comparison and discussion of some differences between both developments.

[edwardchalstrey1]

2. discussion

@acocac It seems like intake-stac should already work provided the json "collection" is set up similarly to this

I think the best way to decide which route to go down is to pick some datasets to add, then we can use those as examples to help decide the best method.

Is there one in particular you would like to add?

[acocac]

I'd suggest starting with those collections which don't require authentication.

For instance, we can try with a STAC catalog hosted in AWS, https://stacindex.org/catalogs/earth-search#/

and try to load this collection:
https://stacindex.org/catalogs/earth-search#/Cnz1sryATwWudkxyZekxWx6356v9RmvvCcLLw79uHWJUDvt2?t=2

If we're successful, then we can connect the fetched collection with CV models suited for satellite images, see for instance a recent discussion in one of the repositories of the Urban Grammar project.

[edwardchalstrey1]

This branch is superseded by the branch stac-load

[edwardchalstrey1]

Closing due to #318